quiz 2 - 10. What is the overall composition of the eutectic

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EMA 3013C Spring 2011 Quiz 2 1. You should already have a Sn-Bi phase diagram with points plotted on it. Attach it to your submission. 2. How do your points differ from those on the phase diagram? Why? 3. Briefly explain the thermocouple (Seebeck) effect. 4. Label your phase diagram including all single and two phase regions. Name the solid phase of pure Bi, γ . Consider an alloy of 35 wt.% Bi slow cooled to just below 139° C for the following questions. 5. What is the composition and relative amount of proeutectic β ? 6. What is the composition and relative amount of γ ? 7. What is the composition and relative amount of β formed from the eutectic reaction? Hint: Your relative amounts from questions 5, 6, and 7 must add up to 100%. 8. What is the composition and relative amount of all of the β ? 9. What is the composition and relative amount of all of the γ ?
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Unformatted text preview: 10. What is the overall composition of the eutectic microconstituent? 11. Each of the following phase diagrams a-d has and error. Circle the error. 12. Explain the error in 11a. 13. Explain the error in 11b. 14. Explain the error in 11c. 15. The following contains the pressure-temperature unary phase diagram for Bismuth. From this diagram, explain how you can determine that melting Bismuth at 1 atm results in a reduction in volume, and consequently, freezing Bismuth at 1 atm results in an expansion in volume. That is to say, at one atm, the volume of solid bismuth is greater than the volume of the liquid. 16. Using the ternary isotherm below , determine the relative amounts of , , and for a composition of 1/3 A, 1/3 B, and 1/3 C. 17. Using the same isotherm, determine the composition of a structure that contains 1/3 , 1/3 , and 1/3 ....
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quiz 2 - 10. What is the overall composition of the eutectic

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